Re: [Roll] multicast & MLD on LLN

Carsten Bormann <cabo@tzi.org> Wed, 15 October 2014 21:16 UTC

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From: Carsten Bormann <cabo@tzi.org>
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Date: Wed, 15 Oct 2014 23:16:53 +0200
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] multicast & MLD on LLN
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On 15 Oct 2014, at 22:38, Kerry Lynn <kerlyn@ieee.org> wrote:

> Surely you'd want to do OTA updates in a secure fashion?  Does this highlight
> a need for secure multicast?

What is the security objective here?
If it is integrity/authenticity, this is best done with object security on the OTA image, which also can provide confidentiality for the bits in the OTA image.
(I don’t think there is a need [or even a way] to keep the fact that an OTA update is occurring confidential.)

Grüße, Carsten